Abstract
The discovery of superconductivity in infinite-layer nickelates has attracted much attention due to their association to the high-Tc cuprates. Cuprate superconductivity was first demonstrated in bulk samples and subsequently in thin films. In the nickelates, however, the situation has been reversed: although surging as a bulk phenomenon, nickelate superconductivity has only been reported in thin films so far. At the same time, the specifics of infinite-layer nickelates yield distinct interface and surface effects that determine their bulk vs thin-film behavior. In this paper, we provide an overview on these important aspects.
Highlights
The infinite-layer nickelates RNiO2 (R = rare-earth element) have long been discussed as potential cuprate-like high-Tc superconductors [1–4]
Superconductivity has been reported for thicknesses as large as 17 nm (i.e., ~ 50 unit cells), with relatively large critical currents (≳ 200 kA/cm2), and for thin films on different substrates
The synthesis of rare-earth infinite-layer nickelate thin films requires the epitaxial growth of the perovskite precursors RNiO3 in the first place
Summary
The infinite-layer nickelates RNiO2 (R = rare-earth element) have long been discussed as potential cuprate-like high-Tc superconductors [1–4] This idea can be scrutinized experimentally after the discovery of superconductivity in hole-doped NdNiO2 [5] and its subsequent verification in holedoped PrNiO2 and LaNiO2 as well [6–13]. To date, this breakthrough remains limited to thin films The simultaneous control of both sample quality and doping necessary to promote superconductivity in these nickelates turns out to be a real experimental challenge. In this respect, the thin-film approach has proven its advantages. In the following we provide an overview of the current research along this line
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